1.Previous
3.Next

International Association of Geodesy (IAG) and the International Astronomical Union (IAU) use an equatorial radius of 6,378.1366 km (codified as the IAU 2009 value). This equatorial radius is also in the 2003 and 2010 IERS Conventions. It is also the equatorial radius used for the IERS 2003 ellipsoid. If it were really circular, the length of the equator would then be exactly 2? times the radius, namely 40,075.0142 km. The GRS 80 (Geodetic Reference System 1980) as approved and adopted by the IUGG at its Canberra,

1.Previous
3.Next